Blender Git Loki

Edited timeline header layout slightly.

-Made the 'PR' button not align itself to the start/end frame fields, as this makes for a nicer visual rounding of those two numbers.
-Made current frame indicator longer, to allow for display of higher frame numbers
-Removed the auto-keyframe dropdown menu. This exists as a preference, and doesn't need to take up space here. This is not something you're likely to change much after all.
-Made the keying sets menu stay put in the UI. It was moving about depending on what options are selected to the left of it. This sort of moving around should be avoided as much as possible.
-Swapped Add/Delete keyframe buttons. It's more intuitive to have the add key button first.